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That is a regular expression. It is used to select or validate certain types of strings. In this case it looks like it is replacing a url that may have a string of characters following it with something returned from an object.

I wish you the best of luck! There are a couple of regexp experts round here so post your questions, even very simple questions wont be laughed at!! Regexps are mighty difficult at first and then after that, just normal level of difficult .

Anti Linux rants are usually the result of a lack of Linux experience, while anti Windows rants are usually a result of a lot of Windows experience.